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Blast: correlations in the cosmic far-infrared background at 250, 350, and 500 μm reveal clustering of star-forming galaxies
David Hughes
Acceso Abierto
Galaxies: evolution
Galaxies: high-redshift
Infrared: galaxies
Large-scale structure of universe
We detect correlations in the cosmic far-infrared background due to the clustering of star-forming galaxies in observations made with the Balloon-borne Large Aperture Submillimeter Telescope, at 250, 350, and 500μm. We perform jackknife and other tests to confirm the reality of the signal. The measured correlations are well fitted by a power law over scales of 5´–25´, with ∆I/I = 15.1% ±1.7%. We adopt a specific model for submillimeter sources in which the contribution to clustering comes from sources in the redshift ranges 1.3≤ z≤ 2.2, 1.5 ≤ z ≤ 2.7, and 1.7 ≤ z ≤ 3.2, at 250, 350, and 500μm, respectively. With these distributions, our measurement of the power spectrum, P(kθ ), corresponds to linear bias parameters, b = 3.8 ±0.6, 3.9 ±0.6, and 4.4 ±0.7, respectively. We further interpret the results in terms of the halo model, and find that at the smaller scales, the simplest halo model fails to fit our results. One way to improve the fit is to increase the radius at which dark matter halos are artificially truncated in the model, which is equivalent to having some star-forming galaxies at z ≥ 1 located in the outskirts of groups and clusters. In the context of this model, we find a minimum halo mass required to host a galaxy is log(Mmin/M⊙) = 11.5⁺⁰˙⁴₋₀․₁, and we derive effective biases beff = 2.2 ±0.2, 2.4 ±0.2, and 2.6 ±0.2, and effective masses log(Meff/M⊙) = 12.9 ±0.3, 12.8 ±0.2, and 12.7 ±0.2, at 250, 350 and 500μm, corresponding to spatial correlation lengths of r₀ = 4.9, 5.0, and 5.2 ±0.7h⁻¹ Mpc, respectively. Finally, we discuss implications for clustering measurement strategies with Herschel and Planck.
The Astrophysical Journal
Público en general
Viero, Marco P., et al., (2009). Blast: correlations in the cosmic far-infrared background at 250, 350, and 500 μm reveal clustering of star-forming galaxies, The Astrophysical Journal. Vol. 707(2):1766–1778
Versión aceptada
acceptedVersion - Versión aceptada
Appears in Collections:Artículos de Astrofísica

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